oj.uz

답안 #473390

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
473390 2021-09-15T13:00:33 Z ZaZo_ Paths (BOI18_paths) C++14
43 / 100
 329 ms 41788 KB 
#include <bits/stdc++.h>
#define ZAZO ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define int long long
using namespace std;
int n , m , k;
int cols[300001],another[300001][6]={0};
vector<int>edges[300001];
set<vector<int>>ans;
void dfs(int node,set<int>path,vector<int>path2,int par)
{
  if(path2.size()==0){
  path2.push_back(node);
  path.insert(cols[node]);
  }
  for(int i = 0 ; i < edges[node].size() ; i++)
  {
    if(edges[node][i]!=par && !path.count(cols[edges[node][i]]) && path.size()<=k ){
      path.insert(cols[edges[node][i]]);
      path2.push_back(edges[node][i]);
      ans.insert(path2);
      dfs(edges[node][i] , path , path2 , node);
      path2.erase(path2.begin()+(path2.size()-1));
      path.erase(cols[edges[node][i]]);
    }
  }
}
int32_t main() {
  ZAZO
  int an2=0;
  cin >> n >> m >> k ;
  vector<pair<int,int>>e;
  for(int i = 1 ; i <= n ; i++)
  {
    cin>>cols[i];
  }
  for(int i = 0 ; i < m ; i++)
  {
    int u , v;
    cin >> u >> v;
    e.push_back({u,v});
    if(cols[u]!=cols[v]) an2+=2;
    edges[u].push_back(v);
    edges[v].push_back(u);
    another[u][cols[v]]++;
    another[v][cols[u]]++;
  }
  if(n<=100 && m<=100 && k<=4)
  {
    //ba7sb kol path w dah bya5od time 3aly f 7ygeeb awel subtask
    for(int i = 1 ; i <= n ; i++)
    {
      dfs(i,{},{},-1);
    }
    cout<<ans.size()<<endl;
  }
  else
  {
    //subtask 2
    //k<=3 that's mean that maximum path = 3
    if(k==1){
      cout<<"0";
      return 0;
    }
    if(k==2){
      cout<<an2;
      return 0;
    }
    int ans2=an2;
    for(int o=0;o<e.size();o++)
    {
      int i = e[o].first , j=e[o].second;
      for(int p = 1 ;  p <= k ; p ++)
      {
        if(p!=cols[i]&&p!=cols[j]&&cols[i]!=cols[j]&&i!=j)
        {
        //  cout<<i<< " "<<j<<" "<<p<<" "<<another[i][p]+another[j][p]<<endl;
          ans2+=another[i][p]+another[j][p];
        }
      }
    }
 
    cout<<ans2<<endl;
  }
}

Compilation message

paths.cpp: In function 'void dfs(long long int, std::set<long long int>, std::vector<long long int>, long long int)':
paths.cpp:15:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |   for(int i = 0 ; i < edges[node].size() ; i++)
      |                   ~~^~~~~~~~~~~~~~~~~~~~
paths.cpp:17:79: warning: comparison of integer expressions of different signedness: 'std::set<long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   17 |     if(edges[node][i]!=par && !path.count(cols[edges[node][i]]) && path.size()<=k ){
      |                                                                    ~~~~~~~~~~~^~~
paths.cpp: In function 'int32_t main()':
paths.cpp:69:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   69 |     for(int o=0;o<e.size();o++)
      |                 ~^~~~~~~~~

Subtask #1
23.0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 7500 KB Output is correct
2 Correct 5 ms 7372 KB Output is correct
3 Correct 5 ms 7372 KB Output is correct
4 Correct 4 ms 7372 KB Output is correct
5 Correct 5 ms 7372 KB Output is correct
6 Correct 6 ms 7636 KB Output is correct
7 Correct 7 ms 7628 KB Output is correct
8 Correct 5 ms 7372 KB Output is correct
9 Correct 5 ms 7372 KB Output is correct
10 Correct 5 ms 7372 KB Output is correct

Subtask #2
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 97 ms 21484 KB Output is correct
2 Correct 83 ms 22672 KB Output is correct
3 Correct 315 ms 41560 KB Output is correct
4 Correct 133 ms 24616 KB Output is correct
5 Correct 178 ms 24616 KB Output is correct
6 Correct 250 ms 34512 KB Output is correct
7 Correct 329 ms 41460 KB Output is correct
8 Correct 297 ms 41788 KB Output is correct

Subtask #3
0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 7500 KB Output is correct
2 Correct 5 ms 7372 KB Output is correct
3 Correct 5 ms 7372 KB Output is correct
4 Correct 4 ms 7372 KB Output is correct
5 Correct 5 ms 7372 KB Output is correct
6 Correct 6 ms 7636 KB Output is correct
7 Correct 7 ms 7628 KB Output is correct
8 Correct 5 ms 7372 KB Output is correct
9 Correct 5 ms 7372 KB Output is correct
10 Correct 5 ms 7372 KB Output is correct
11 Correct 97 ms 21484 KB Output is correct
12 Correct 83 ms 22672 KB Output is correct
13 Correct 315 ms 41560 KB Output is correct
14 Correct 133 ms 24616 KB Output is correct
15 Correct 178 ms 24616 KB Output is correct
16 Correct 250 ms 34512 KB Output is correct
17 Correct 329 ms 41460 KB Output is correct
18 Correct 297 ms 41788 KB Output is correct
19 Correct 101 ms 21488 KB Output is correct
20 Correct 83 ms 22760 KB Output is correct
21 Correct 292 ms 41372 KB Output is correct
22 Correct 165 ms 24564 KB Output is correct
23 Correct 140 ms 24616 KB Output is correct
24 Correct 232 ms 34516 KB Output is correct
25 Correct 305 ms 41384 KB Output is correct
26 Correct 308 ms 41788 KB Output is correct
27 Incorrect 81 ms 22696 KB Output isn't correct
28 Halted 0 ms 0 KB -

Subtask #4
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 7372 KB Output is correct
2 Incorrect 29 ms 11608 KB Output isn't correct
3 Halted 0 ms 0 KB -